How to use this tool
- Use the visual fields or edit an advanced five-field expression.
- Choose the timezone used by your scheduler.
- Calculate five or ten upcoming dates and review their UTC equivalents.
Check a schedule across a daylight-saving boundary
Preview a daily local-time job using the bundled cron-parser 5.x behavior. Compare UTC instants with the named timezone before configuring your scheduler.
Input
30 2 * * * Timezone: America/New_York Start: 2026-03-07T00:00:00Z
Expected output
2026-03-07T07:30:00.000Z 2026-03-08T07:30:00.000Z 2026-03-09T06:30:00.000Z 2026-03-10T06:30:00.000Z 2026-03-11T06:30:00.000Z
In spring the parser adjusts the missing 02:30 wall-clock time. The fall example checks 01:30 across the repeated hour. These are previews from this parser, not an exactly-once execution guarantee; reproduce them in the scheduler you deploy.
| UTC instant | America/New_York |
|---|---|
2026-03-07T07:30:00.000Z | 7 Mar 2026, 02:30:00 GMT-5 |
2026-03-08T07:30:00.000Z | 8 Mar 2026, 03:30:00 GMT-4 |
2026-03-09T06:30:00.000Z | 9 Mar 2026, 02:30:00 GMT-4 |
2026-03-10T06:30:00.000Z | 10 Mar 2026, 02:30:00 GMT-4 |
2026-03-11T06:30:00.000Z | 11 Mar 2026, 02:30:00 GMT-4 |
| UTC instant | America/New_York |
|---|---|
2026-10-31T05:30:00.000Z | 31 Oct 2026, 01:30:00 GMT-4 |
2026-11-01T05:30:00.000Z | 1 Nov 2026, 01:30:00 GMT-4 |
2026-11-02T06:30:00.000Z | 2 Nov 2026, 01:30:00 GMT-5 |
2026-11-03T06:30:00.000Z | 3 Nov 2026, 01:30:00 GMT-5 |
2026-11-04T06:30:00.000Z | 4 Nov 2026, 01:30:00 GMT-5 |
More examples
- 0 9 * * 1-5 runs at 09:00 Monday through Friday in the selected timezone.
- */15 * * * * runs every quarter hour.
- 0 0 29 2 * targets leap days; verify your scheduler’s supported horizon.
Know the limits
Preview uses cron-parser semantics. DST can skip or shift wall-clock times; compare these results with your deployment scheduler. Quartz, seconds and named fields are unsupported.
Common questions
What happens when both day fields are restricted?
This builder uses cron OR semantics: matching either day-of-month or weekday can trigger a run.
Is the preview a hosted scheduler?
No. It only calculates dates in the browser.